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                                <h1 id="&#x7406;&#x89E3;&#x64CD;&#x4F5C;&#x7B26;&#x5BFC;&#x5165;">&#x7406;&#x89E3;&#x64CD;&#x4F5C;&#x7B26;&#x5BFC;&#x5165;</h1>
<p>&#x5728;&#x6D88;&#x8D39;&#x6216;&#x521B;&#x5EFA;&#x4F9D;&#x8D56;&#x4E8E; RxJS &#x7684;&#x516C;&#x5171;&#x5E93;&#x65F6;&#xFF0C;&#x4F60;&#x53EF;&#x80FD;&#x9047;&#x5230;&#x5904;&#x7406;&#x8FD0;&#x7B97;&#x7B26;&#x5BFC;&#x5165;&#x7684;&#x95EE;&#x9898;&#x3002;&#x5728;&#x9879;&#x76EE;&#x4E2D;&#x5F15;&#x5165;&#x64CD;&#x4F5C;&#x7B26;&#x6700;&#x4E3B;&#x8981;&#x7684;&#x65B9;&#x5F0F;&#x50CF;&#x4E0B;&#x9762;&#x8FD9;&#x6837;&#x5BFC;&#x5165;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token string">&apos;rxjs/add/operator/take&apos;</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x8FD9;&#x4F1A;&#x5C06;&#x5BFC;&#x5165;&#x7684;&#x64CD;&#x4F5C;&#x7B26;&#x6DFB;&#x52A0;&#x5230; <code>Observable</code> &#x7684;&#x539F;&#x578B;&#x4E0A;&#xFF0C;&#x4EE5;&#x4FBF;&#x5728;&#x6574;&#x4E2A;&#x9879;&#x76EE;&#x4E2D;&#x4F7F;&#x7528;:</p>
<p><a href="https://github.com/ReactiveX/rxjs/blob/master/src/add/operator/take.ts" target="_blank">(&#x6E90;&#x7801;)</a></p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> Observable <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;../../Observable&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> take <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;../../operator/take&apos;</span><span class="token punctuation">;</span>

Observable<span class="token punctuation">.</span>prototype<span class="token punctuation">.</span>take <span class="token operator">=</span> take<span class="token punctuation">;</span>

declare module <span class="token string">&apos;../../Observable&apos;</span> <span class="token punctuation">{</span>
  <span class="token keyword">interface</span> <span class="token class-name">Observable</span><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    take<span class="token punctuation">:</span> <span class="token keyword">typeof</span> take<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5BF9;&#x4E8E;&#x79C1;&#x6709;&#x9879;&#x76EE;&#x548C;&#x6A21;&#x5757;&#xFF0C;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x901A;&#x5E38;&#x662F;&#x201C;&#x6CA1;&#x95EE;&#x9898;&#x7684;&#x201D;&#xFF0C;&#x4F46;&#x5F53;&#x6574;&#x4E2A;&#x56E2;&#x961F;&#x4F7F;&#x7528;&#x540C;&#x4E00;&#x4E2A; <a href="https://www.npmjs.com/" target="_blank">npm</a> &#x5305;&#x6216;&#x5E93;&#x65F6;&#x518D;&#x4F7F;&#x7528;&#x8FD9;&#x79CD;&#x5BFC;&#x5165;&#x65B9;&#x5F0F;&#xFF0C;&#x95EE;&#x9898;&#x5C31;&#x4F1A;&#x51FA;&#x73B0;&#x3002;</p>
<div class="native-ad"></div>

<h3 id="&#x7B80;&#x5355;&#x793A;&#x4F8B;">&#x7B80;&#x5355;&#x793A;&#x4F8B;</h3>
<p>&#x6765;&#x770B;&#x770B;&#x95EE;&#x9898;&#x51FA;&#x5728;&#x54EA;&#x91CC;&#xFF0C;&#x5047;&#x8BBE;<strong>&#x5C0F;A</strong>&#x521B;&#x5EFA;&#x4E86;&#x4E00;&#x4E2A;&#x516C;&#x6709;&#x7684; Angular &#x7EC4;&#x4EF6;&#x5E93;&#x3002;&#x5728;&#x8FD9;&#x4E2A;&#x5E93;&#x4E2D;&#x9700;&#x8981;&#x4E00;&#x4E9B;&#x64CD;&#x4F5C;&#x7B26;&#xFF0C;&#x4E0B;&#x9762;&#x4EE5;&#x4F20;&#x7EDF;&#x7684;&#x65B9;&#x5F0F;&#x8FDB;&#x884C;&#x4E86;&#x5BFC;&#x5165;:</p>
<p><em>some-public-library.ts</em></p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token string">&apos;rxjs/add/operator/take&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token string">&apos;rxjs/add/operator/concatMap&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token string">&apos;rxjs/add/operator/switchMap&apos;</span><span class="token punctuation">;</span>
</code></pre>
<p><strong>&#x5C0F;B</strong>&#x5F15;&#x7528;&#x4E86;&#x5C0F;A&#x7684;&#x5E93;&#x3002;&#x5C3D;&#x7BA1;&#x4ED6;&#x5E76;&#x6CA1;&#x6709;&#x5BFC;&#x5165;&#x8FD9;&#x4E9B;&#x64CD;&#x4F5C;&#x7B26;&#xFF0C;&#x4F46;&#x4ED6;&#x4F9D;&#x7136;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x3002;<strong>&#x8FD9;&#x53EF;&#x80FD;&#x4E0D;&#x662F;&#x4EC0;&#x4E48;&#x5927;&#x95EE;&#x9898;&#xFF0C;&#x4F46;&#x786E;&#x5B9E;&#x4F1A;&#x5E26;&#x6765;&#x4E00;&#x4E9B;&#x56F0;&#x6270;</strong>&#x3002;&#x5C0F;B&#x7EE7;&#x7EED;&#x4F7F;&#x7528;&#x5E93;&#x548C;&#x8FD9;&#x4E9B;&#x64CD;&#x4F5C;&#x7B26;&#xFF0C;&#x4E00;&#x5207;&#x90FD;&#x5F88;&#x6B63;&#x5E38;...</p>
<p>&#x4E00;&#x4E2A;&#x6708;&#x540E;&#xFF0C;<strong>&#x5C0F;A</strong>&#x51B3;&#x5B9A;&#x66F4;&#x65B0;&#x81EA;&#x5DF1;&#x7684;&#x5E93;&#x3002;&#x4ED6;&#x4E0D;&#x518D;&#x9700;&#x8981; <code>switchMap</code> &#x6216; <code>concatMap</code>&#xFF0C;&#x6240;&#x4EE5;&#x4ED6;&#x5220;&#x9664;&#x4E86;&#x5BFC;&#x5165;:</p>
<p><em>some-public-library.ts</em></p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token string">&apos;rxjs/add/operator/take&apos;</span><span class="token punctuation">;</span>
</code></pre>
<p><strong>&#x5C0F;B</strong>&#x66F4;&#x65B0;&#x4E86;&#x4F9D;&#x8D56;&#x5E76;&#x6784;&#x5EFA;&#x81EA;&#x5DF1;&#x7684;&#x9879;&#x76EE;&#xFF0C;&#x4F46;&#x8FD9;&#x6B21;&#x5931;&#x8D25;&#x4E86;&#x3002;&#x4ED6;&#x672C;&#x8EAB;&#x5E76;&#x6CA1;&#x6709;&#x5F15;&#x5165; <code>switchMap</code> &#x6216; <code>concatMap</code>&#xFF0C;&#x53EA;&#x662F;&#x57FA;&#x4E8E;&#x7B2C;&#x4E09;&#x65B9;&#x7684;&#x4F9D;&#x8D56;&#x624D;&#x80FD;<strong>&#x6B63;&#x5E38;&#x8FD0;&#x884C;</strong>&#x3002;&#x5982;&#x679C;&#x4F60;&#x5E76;&#x6CA1;&#x6709;&#x610F;&#x8BC6;&#x5230;&#x8FD9;&#x6837;&#x4F1A;&#x4EA7;&#x751F;&#x95EE;&#x9898;&#xFF0C;&#x90A3;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x4E00;&#x70B9;&#x65F6;&#x95F4;&#x6765;&#x5F04;&#x6E05;&#x695A;&#x3002;</p>
<h3 id="&#x89E3;&#x51B3;&#x65B9;&#x6848;">&#x89E3;&#x51B3;&#x65B9;&#x6848;</h3>
<p>&#x4E0D;&#x518D;&#x4F7F;&#x7528;&#x8FD9;&#x79CD;&#x5BFC;&#x5165;&#x65B9;&#x5F0F;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token string">&apos;rxjs/add/operator/take&apos;</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x8FD9;&#x6837;&#x6765;&#x8FDB;&#x884C;&#x5BFC;&#x5165;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> take <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/operator/take&apos;</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x8FD9;&#x6837;&#x53EF;&#x4EE5;&#x4FDD;&#x6301; <code>Observable</code> &#x539F;&#x578B;&#x7684;&#x5E72;&#x51C0;&#xFF0C;&#x8FD9;&#x6837;&#x6765;&#x76F4;&#x63A5;&#x8C03;&#x7528;&#x5B83;&#x4EEC;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> take <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/operator/take&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> <span class="token keyword">of</span> <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/observable/of&apos;</span><span class="token punctuation">;</span>

take<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>
  <span class="token keyword">of</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 
  <span class="token number">2</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x7136;&#x800C;&#x8FD9;&#x6837;&#x4EE3;&#x7801;&#x5F88;&#x5FEB;&#x5C31;&#x4F1A;&#x53D8;&#x5F97;<strong>&#x4E11;&#x964B;&#x4E0D;&#x582A;</strong>&#xFF0C;&#x60F3;&#x8C61;&#x4E00;&#x4E0B;&#x8FD9;&#x6837;&#x66F4;&#x957F;&#x7684;&#x8C03;&#x7528;&#x94FE;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> take <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/operator/take&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> map <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/operator/map&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> <span class="token keyword">of</span> <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/observable/of&apos;</span><span class="token punctuation">;</span>

map<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>
  take<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>
    <span class="token keyword">of</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 
    <span class="token number">2</span>
  <span class="token punctuation">)</span><span class="token punctuation">,</span>
  val <span class="token operator">=&gt;</span> val <span class="token operator">+</span> <span class="token number">2</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x5F88;&#x5FEB;&#x6211;&#x4EEC;&#x7684;&#x4EE3;&#x7801;&#x5757;&#x5C06;&#x53D8;&#x5F97;&#x51E0;&#x4E4E;&#x65E0;&#x6CD5;&#x7406;&#x89E3;&#x3002;&#x6211;&#x4EEC;&#x600E;&#x6837;&#x624D;&#x80FD;&#x4E24;&#x5168;&#x5176;&#x7F8E;&#x5462;&#xFF1F;</p>
<h3 id="pipeable-&#x64CD;&#x4F5C;&#x7B26;">Pipeable &#x64CD;&#x4F5C;&#x7B26;</h3>
<p>&#x73B0;&#x5728; RxJS &#x63D0;&#x4F9B;&#x4E86; <a href="https://github.com/ReactiveX/rxjs/blob/755df9bf908108974e38aaff79887279f2cde008/src/Observable.ts#L305-L329" target="_blank"><code>pipe</code></a> &#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF0C;&#x5B83;&#x5B58;&#x5728;&#x4E8E; <code>Observable</code> &#x4E0A;&#xFF0C;&#x5B83;&#x7F13;&#x89E3;&#x4E86;&#x64CD;&#x4F5C;&#x7B26;&#x4E0D;&#x5728;&#x539F;&#x578B;&#x4E0A;&#x6240;&#x5E26;&#x6765;&#x7684;&#x95EE;&#x9898;&#x3002;&#x6211;&#x4EEC;&#x8FD8;&#x7EE7;&#x7EED;&#x4F7F;&#x7528;&#x4E0A;&#x9762;&#x4E11;&#x964B;&#x7684;&#x4EE3;&#x7801;&#x5757;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> take<span class="token punctuation">,</span> map <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/operators&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> <span class="token keyword">of</span> <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/observable/of&apos;</span><span class="token punctuation">;</span>

map<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>
  take<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>
    <span class="token keyword">of</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 
    <span class="token number">2</span>
  <span class="token punctuation">)</span><span class="token punctuation">,</span>
  val <span class="token operator">=&gt;</span> val <span class="token operator">+</span> <span class="token number">2</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x5E76;&#x5C06;&#x5176;&#x8F6C;&#x6362;&#x6210;:</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">import</span> <span class="token punctuation">{</span> take<span class="token punctuation">,</span> map <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/operators&apos;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> <span class="token keyword">of</span> <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;rxjs/observable/of&apos;</span><span class="token punctuation">;</span>

<span class="token keyword">of</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">pipe</span><span class="token punctuation">(</span>
    <span class="token function">take</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token function">map</span><span class="token punctuation">(</span>val <span class="token operator">=&gt;</span> val <span class="token operator">+</span> <span class="token number">2</span><span class="token punctuation">)</span>
  <span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Much easier to read, right? This also has the benefit of greatly reducing the RxJS bundle size in your application. For more on this, check out <a href="https://twitter.com/Sureshkumar_Ash" target="_blank">Ashwin Sureshkumar&apos;s</a> excellent article <a href="https://hackernoon.com/rxjs-reduce-bundle-size-using-lettable-operators-418307295e85" target="_blank">Reduce Angular app bundle size using lettable operators</a>.</p>
<p>&#x4EE3;&#x7801;&#x53EF;&#x8BFB;&#x6027;&#x66F4;&#x9AD8;&#x4E86;&#xFF0C;&#x662F;&#x5427;&#xFF1F;&#x5B83;&#x8FD8;&#x6709;&#x989D;&#x5916;&#x7684;&#x597D;&#x5904;&#xFF0C;&#x5C31;&#x662F;&#x53EF;&#x4EE5;&#x5927;&#x5927;&#x51CF;&#x5C11;&#x5E94;&#x7528;&#x4E2D; RxJS &#x7684;&#x6253;&#x5305;&#x5C3A;&#x5BF8;&#x3002;&#x60F3;&#x6DF1;&#x5165;&#x4E86;&#x89E3;&#xFF0C;&#x8BF7;&#x53C2;&#x89C1; <a href="https://twitter.com/Sureshkumar_Ash" target="_blank">Ashwin Sureshkumar&apos;s</a> &#x7684;&#x7CBE;&#x5F69;&#x6587;&#x7AE0; <a href="https://hackernoon.com/rxjs-reduce-bundle-size-using-lettable-operators-418307295e85" target="_blank">&#x4F7F;&#x7528; lettable &#x64CD;&#x4F5C;&#x7B26;&#x6765;&#x51CF;&#x5C11; Angular &#x5E94;&#x7528;&#x7684;&#x6253;&#x5305;&#x5C3A;&#x5BF8;</a>&#x3002;</p>

                                
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